Shut off valve replacement

I've searched through the site looking for similar posts, but mine has a TWIST!!!!

We were in the process of replacing our sink, my girlfriend goes to shut off the water at the valve, and the handle/stem snaped off flush. So my first instinct was to go to shut off the water at main the line. After doing so, I turned off the remaining valve (did NOT break), and then turned the handle on so all the remaining water would drain from the line....

After about a minute the pressure got extremely low but there was still a steady stream coming out, I left for about 5 minutes and no change.

So if the main water shut off doesn't stop the water COMPLETELY, how exactly am I going to change out the broken valve that is under the sink?

All tips and tricks are greatly appreciated!!!!

Picture if available would do wonders too

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It could be water draining from upstairs, if there IS an upstairs...if it truly is the main shut off leaking thru, you'll have to turn the water off at the meter (around here they are outside in the yard).

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you could try snugging down on main be careful not to break it....if not running to bad you could open lower faucets to see if that lets you repair the valve....you could see if you can compression valve under sink.....again if not running to bad loosen meter nut and let drain into bucket till you fix and hook back up....hope that helps....picture of broken valve would help...